I started mine two weeks ago (although the last one was cancelled because the weather was so nasty, and I am at petco)... You're going to love it! I'm not sure we really needs the classes, because he's been doing really good so far, but I wanted to go anyway, mostly for the socialization... There are probably around 12 people, all with their puppies, and it's really really fun! I have to admit that we are all so focussed on the dogs that we don't talk to each other at all though LOL.
I got the second lesson tonight actually!